Tool-holder for lathes, planers, and other working-machines.



A. H. RAHM. TOOL HOLDER FOR LATHES, PLANERS, AND OTHER WORKING MACHINES.

APPLICATION FI LBD JUNE 26, 1908.

Patented Jan; 18, 1910.

Z01) n esszas In van/02" UNITED STATES PATENT orrio ARVID HARALD BAHIVI,OF REFTELED, SWEDEN, ASSIGNOR TO JOHAN AUGUST PETERSON, OF REETELED,SWEDEN.

TOOL-HOLDER FOR LATHES, PLANERS, AND OTHER WORKING-MACHINES.

To all whom it may concern:

Be it known that I, Anvil) HARALD RAHM, a subject of the King of Sweden,and resident of Refteled, in the Kingdom of Sweden, have invented newand useful Improvements in Tool-Holders for Lathes, Planers, and otherVVorking-Machines, of which the following is a specification, referencebeing had to the drawing accompanying and forming a part hereof.

This invention relates to tool holders for lathes, planers and otherworking machines.

The object of the invention is to make it possible to readily and firmlyadjust the tool of a lathe, planer, or other working machine withincertain limits in any desired plane or any desired angle to the work,without any wedges or packings of any kind being used, and to make itpossible to secure the tool by a single grip by which the tool is notonly secured in the holder but at the 'same time the latter is firmlysecured to the slide rest or the table or the like on which the holderis mounted.

The invention consists, chiefly, in the co1nbination of a lower support,an upper support, means for pressing the said supports toward eachother, and clamping parts for the tool mounted between the said supportsin such a manner as to be able to swing bodily like a pendulum about acommon center.

The invention may be carried out as follows: The tool holder is securedto the working table or the slide rest movable thereon by an uprightpost or screw bolt which may be attached to the table or slide rest inany suitable way. The tool holder is suitably mounted about the saidbolt or post in such a manner as to be able to swing about a ver ticalaxis so that the tool may be adjusted to operate the work from differentsides. The parts of the holder formed by the clamping plates or blocksform together a pendulum (ordinary or rotary) whose center ofoscillation is located 011 the longitudinal axis of the verticalconnecting bolt. By this means it is not only possible to adjust thetool in a more or less inclined position but it is also possible toadjust the angle of the cutting edge of the tool in relation to thedirect-ion of the cut in the work. The tool holder is divided, in thelongitudinal direction of the upright post or connecting bolt, into twoparts, one forming a support for the tool Specification of LettersPatent.

Application filed June 26, 1908.

Patented Jan. 18, 1910.

Serial No. 440,509.

and the other provided with a set screw for clamping the tool inposition. When the said screw is tightened against the tool, the twoparts of the tool holder are at the same time moved slightly apart bywhich the said parts are firmly clamped between the upper and lowersupports.

The invention further consists in the construction and combination ofparts hereinafter set forth.

In the drawing, Figures 1 and 2 are side views, at right angles to eachother, of a tool holder embodying the invention. Fig. 3 is a plan-viewof the said tool holder.

Referring to the drawing, a is acentral post or bolt connecting theparts of the tool holder which is shown in a form adapted for use inengine-lathes. The lower end of the said post or bolt may be supportedin the usual slide rest (not illustrated).

Placed on the post a are the clampingplates or blocks 6 and c of whichthe lower one Z) serves as a support for the tool which is placed on theupper bearing surfaces d, (Z of the said plate I). The tool 0 is clampedagainst the said bearing surfaces (Z, (Z by a screw 7 screwed into thepart c. The parts 0 and c, of which the upper one is suitably guided inthe lower one, are movable in the longitudinal direction of the post a.lVhen the screw is tightened against the tool 6, the parts I) and c arepressed slightly apart, whereby the said parts are firmly clampedbetween the underlying base-plate at one side and the nut g screwed onthe upper, screw-threaded end of the post or bolt a at the other side.At the same time the tool 0 is firmly clamped in position.

The parts Z) and 0 of the tool holder may be said to form a pendulumadapted to swing about a fulcrum on the longitudinal axis of the bolt04. It is obvious that the parts Z) and c of the tool holder may bemounted so as to be capable of swinging in any direction in the samemanner as a rotary pendulum. In the embodiment illustrated said partsare, however, capable of swinging only in one vertical plane in the samemanner as an ordinary pendulum. The underside h of the part b issupposed to be formed to the shape of the segment of a cylinder andbears on a correspondingly recessed shoe or base-plate 2' so that thepart b rests conformably and movably upon the said plate. The nut gbears with its lower side on a part 76 the lower side Z of which isconcentric to the lower side it of the part b and bears on thecorrespondingly recessed upper side of the part 0. The tool holderproper b, 0 may thus be swung in one direction or the other between andalong the concentric cylindrical surfaces 72, and Z, whereby the tool ewill, obviously, be caused to take up a more or less inclined position.In order to enable such a swinging movement to be performed, the clampsmust, obviously be eased by loosening the screw f by which not only thetool but all the parts of the tool holder will be movable. By a slightturning of the screw f the tool 6 and all the parts of the tool holderare firmly secured in relation to each other and to the slide rest orworking table.

A special advantage of the constructiim described is that the tool maybe readily and firmly adjusted in any desired positi0n,without the anglebetween the tool and the set screw f being changed. The tool will,therefore, always be reliably secured in position, and the drawback ofthe set screw sliding against the tool, which is frequently met with,when the adjustment of the tool is performed by wedges or other similarparts, is entirely removed.

If it is desired that the tool holder 12 0 shall be adapted to swing inany direction like a rotary pendulum, the surfaces It and Z mustobviously be formed to the shape of the segment of a sphere instead ofto the segment of a cylinder. In such case the lower clamp 6 must,obviously, be provided with a wide opening for the post a in order toallow the swinging movement of the clamps.

I11 order to prevent shavings and the like from entering between thebearing surfaces of the parts Z) and i a recess or channel on open atboth ends may be provided in the shoe or base-plate z", the bottom ofsaid channel lying at a lower level than the said bearing surfaces.Shavings and the like may thus accumulate on the bottom of the saidchannel from whence they may be easily removed from time to time. Inorder to prevent the shavings in the channel 021 from entering betweenthe aforesaid bearing surfaces, small downwardly projecting flanges umay be provided at the clamp 19.

A further advantage of the construction hereinbefore described is thatthe tool is entirely free at one side, so that it may easily be removedand re-inserted sidewise, instead of being moved through an opening, asis usually the case in other tool holders. This facilitates the use oftools of any shape and size of the cutting end, and the part of the toolsituated in the holder may be of any desired width.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is 1. In a tool-holder, the combination of alower support, an upper support, means for pressing the said supportstoward each other, clamping parts for the tool mounted between the saidsupports in such a manner as to be able to swing bodily about a commoncenter, the upper one of the said clamping parts being supported at oneside by the lower clamping part, and a set screw mounted in the upperclamping part, remote from the fulcrum of the upper clamping part on thelower one, said screw bearing with its lower end on the tool,substantially as and for the purpose set forth.

2. In a tool-holder, the combination of a lower support, an uppersupport, means for pressing the said supports toward each other,clamping parts mounted between the said supports in such manner as to beable to swing bodily about a common center, the lower one of saidclamping parts having a supporting surface for the tool allowing thelatter to be placed in position and removed laterally, without changingthe position of the clamping parts, and a set screw carried by the upperclamping part and adapted to be screwed on to the tool, substantially asand for the purpose set forth.

3. I11 a tool holder, the combination of a lower support having an upperconcavelycurved bearing surface, an upper support having a lowerconveXly-curved bearing surface concentric with the bearing surface ofthe lower support, means for pressing the said supports toward eachother, clamping parts loosely mounted bet-ween the bearing surfaces ofthe said supports and resting conformably and movably against the saidbearing surfaces, said bearing surfaces having such a form as to allowthe said clamping parts to swing bodily about a common center, andprotecting flanges projecting downwardly from the lower clamping partinto a longitudinal groove in said lower support, substantially as andfor the purpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribin witnesses.

ARVID I-IAR-ALD RAHM.

WVitnesses JUsrUs ELGSKOG, J. P. FREDMAN.

